Following this month's mass shooting in Las Vegas that left dozens dead and hundreds more injured -- the deadliest in modern U.S. history -- lawmakers took another look at gun control legislation.

According to the Center for Responsive Politics' donation tracker, OpenSecrets.org, gun rights groups overwhelmingly side with Republicans, and they give a lot more money than their gun-control-supporting counterparts.

In the 2016 federal election cycle, gun rights groups donated more than $6.2 million, a record for gun lobbyists since at least 1990, and about 98 percent of that went to Republican campaigns. Meanwhile, gun control advocates contributed about $1.6 million to the same election, 98 percent of which went to Democratic candidates.

The Center for Responsive Politics reported that more than half of the U.S. House of Representatives received money from gun rights groups, such as the National Rifle Assocation, National Association for Gun Rights and Safari Club International.

Politico tallied the contributions to representatives in the 2016 election cycle.